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// Copyright 2004-present Facebook. All Rights Reserved.
#include "src/StandardReactiveSocket.h"
#include <folly/Conv.h>
#include <folly/ExceptionWrapper.h>
#include <folly/Memory.h>
#include <folly/MoveWrapper.h>
#include <folly/io/async/EventBase.h>
#include "src/ClientResumeStatusCallback.h"
#include "src/ConnectionAutomaton.h"
#include "src/FrameTransport.h"
#include "src/RequestHandler.h"
namespace reactivesocket {
StandardReactiveSocket::~StandardReactiveSocket() {
debugCheckCorrectExecutor();
// Force connection closure, this will trigger terminal signals to be
// delivered to all stream automata.
close();
}
StandardReactiveSocket::StandardReactiveSocket(
ReactiveSocketMode mode,
std::shared_ptr<RequestHandler> handler,
Stats& stats,
std::unique_ptr<KeepaliveTimer> keepaliveTimer,
folly::Executor& executor)
: handler_(handler),
connection_(std::make_shared<ConnectionAutomaton>(
executor,
[this, handler](std::unique_ptr<folly::IOBuf> serializedFrame) {
onConnectionFrame(handler, std::move(serializedFrame));
},
handler,
std::bind(
&StandardReactiveSocket::resumeListener,
this,
std::placeholders::_1),
stats,
std::move(keepaliveTimer),
mode)),
executor_(executor) {
// TODO: In case of server, FrameSerializer should be ideally set after
// inspecting the SETUP frame from the client
connection_->setFrameSerializer(FrameSerializer::createCurrentVersion());
debugCheckCorrectExecutor();
stats.socketCreated();
}
std::unique_ptr<StandardReactiveSocket>
StandardReactiveSocket::fromClientConnection(
folly::Executor& executor,
std::unique_ptr<DuplexConnection> connection,
std::unique_ptr<RequestHandler> handler,
ConnectionSetupPayload setupPayload,
Stats& stats,
std::unique_ptr<KeepaliveTimer> keepaliveTimer) {
auto socket = disconnectedClient(
executor, std::move(handler), stats, std::move(keepaliveTimer));
socket->clientConnect(
std::make_shared<FrameTransport>(std::move(connection)),
std::move(setupPayload));
return socket;
}
std::unique_ptr<StandardReactiveSocket>
StandardReactiveSocket::disconnectedClient(
folly::Executor& executor,
std::unique_ptr<RequestHandler> handler,
Stats& stats,
std::unique_ptr<KeepaliveTimer> keepaliveTimer) {
std::unique_ptr<StandardReactiveSocket> socket(new StandardReactiveSocket(
ReactiveSocketMode::CLIENT,
std::move(handler),
stats,
std::move(keepaliveTimer),
executor));
socket->connection_->setFrameSerializer(
FrameSerializer::createCurrentVersion());
return socket;
}
std::unique_ptr<StandardReactiveSocket>
StandardReactiveSocket::fromServerConnection(
folly::Executor& executor,
std::unique_ptr<DuplexConnection> connection,
std::unique_ptr<RequestHandler> handler,
Stats& stats,
bool isResumable) {
// TODO: isResumable should come as a flag on Setup frame and it should be
// exposed to the application code. We should then remove this parameter
auto socket = disconnectedServer(executor, std::move(handler), stats);
socket->serverConnect(
std::make_shared<FrameTransport>(std::move(connection)), isResumable);
return socket;
}
std::unique_ptr<StandardReactiveSocket>
StandardReactiveSocket::disconnectedServer(
folly::Executor& executor,
std::unique_ptr<RequestHandler> handler,
Stats& stats) {
std::unique_ptr<StandardReactiveSocket> socket(new StandardReactiveSocket(
ReactiveSocketMode::SERVER,
std::move(handler),
stats,
nullptr,
executor));
return socket;
}
std::shared_ptr<Subscriber<Payload>> StandardReactiveSocket::requestChannel(
std::shared_ptr<Subscriber<Payload>> responseSink) {
debugCheckCorrectExecutor();
checkNotClosed();
return connection_->streamsFactory().createChannelRequester(
std::move(responseSink), executor_);
}
void StandardReactiveSocket::requestStream(
Payload request,
std::shared_ptr<Subscriber<Payload>> responseSink) {
debugCheckCorrectExecutor();
checkNotClosed();
connection_->streamsFactory().createStreamRequester(
std::move(request), std::move(responseSink), executor_);
}
void StandardReactiveSocket::requestSubscription(
Payload request,
std::shared_ptr<Subscriber<Payload>> responseSink) {
debugCheckCorrectExecutor();
checkNotClosed();
connection_->streamsFactory().createSubscriptionRequester(
std::move(request), std::move(responseSink), executor_);
}
void StandardReactiveSocket::requestResponse(
Payload payload,
std::shared_ptr<Subscriber<Payload>> responseSink) {
debugCheckCorrectExecutor();
checkNotClosed();
connection_->streamsFactory().createRequestResponseRequester(
std::move(payload), std::move(responseSink), executor_);
}
void StandardReactiveSocket::requestFireAndForget(Payload request) {
debugCheckCorrectExecutor();
checkNotClosed();
Frame_REQUEST_FNF frame(
connection_->streamsFactory().getNextStreamId(),
FrameFlags_EMPTY,
std::move(std::move(request)));
connection_->outputFrameOrEnqueue(
connection_->frameSerializer().serializeOut(std::move(frame)));
}
void StandardReactiveSocket::metadataPush(
std::unique_ptr<folly::IOBuf> metadata) {
debugCheckCorrectExecutor();
checkNotClosed();
connection_->outputFrameOrEnqueue(connection_->frameSerializer().serializeOut(
Frame_METADATA_PUSH(std::move(metadata))));
}
void StandardReactiveSocket::onConnectionFrame(
std::shared_ptr<RequestHandler> handler,
std::unique_ptr<folly::IOBuf> serializedFrame) {
debugCheckCorrectExecutor();
auto type = connection_->frameSerializer().peekFrameType(*serializedFrame);
switch (type) {
case FrameType::SETUP: {
Frame_SETUP frame;
if (!connection_->deserializeFrameOrError(
frame, std::move(serializedFrame))) {
return;
}
if (frame.header_.flags_ & FrameFlags_LEASE) {
// TODO(yschimke) We don't have the correct lease and wait logic above
// yet
LOG(WARNING) << "ignoring setup frame with lease";
// connectionOutput_.onNext(
// Frame_ERROR::badSetupFrame("leases not supported")
// .serializeOut());
// disconnect();
}
connection_->setFrameSerializer(
FrameSerializer::createFrameSerializer(folly::to<std::string>(
frame.versionMajor_, ".", frame.versionMinor_)));
ConnectionSetupPayload setupPayload;
frame.moveToSetupPayload(setupPayload);
auto streamState =
handler->handleSetupPayload(*this, std::move(setupPayload));
// TODO(lehecka): use again
// connection.useStreamState(streamState);
break;
}
case FrameType::RESUME: {
Frame_RESUME frame;
if (!connection_->deserializeFrameOrError(
frame, std::move(serializedFrame))) {
return;
}
auto resumed =
handler->handleResume(*this, frame.token_, frame.position_);
if (!resumed) {
// TODO(lehecka): the "connection" and "this" arguments needs to be
// cleaned up. It is not intuitive what is their lifetime.
auto connectionCopy = std::move(connection_);
connectionCopy->closeWithError(
Frame_ERROR::connectionError("can not resume"));
}
break;
}
case FrameType::METADATA_PUSH: {
Frame_METADATA_PUSH frame;
if (!connection_->deserializeFrameOrError(
frame, std::move(serializedFrame))) {
return;
}
handler->handleMetadataPush(std::move(frame.metadata_));
break;
}
case FrameType::REQUEST_CHANNEL:
case FrameType::REQUEST_STREAM:
case FrameType::REQUEST_SUB:
case FrameType::REQUEST_RESPONSE:
case FrameType::REQUEST_FNF:
case FrameType::LEASE:
case FrameType::KEEPALIVE:
case FrameType::RESERVED:
case FrameType::REQUEST_N:
case FrameType::CANCEL:
case FrameType::RESPONSE:
case FrameType::ERROR:
case FrameType::RESUME_OK:
default:
auto connectionCopy = std::move(connection_);
connectionCopy->closeWithError(Frame_ERROR::unexpectedFrame());
}
}
std::shared_ptr<StreamState> StandardReactiveSocket::resumeListener(
const ResumeIdentificationToken& token) {
debugCheckCorrectExecutor();
CHECK(false) << "not implemented";
// TODO(lehecka)
return nullptr;
// return handler_->handleResume(token);
}
void StandardReactiveSocket::clientConnect(
std::shared_ptr<FrameTransport> frameTransport,
ConnectionSetupPayload setupPayload) {
CHECK(frameTransport && !frameTransport->isClosed());
debugCheckCorrectExecutor();
checkNotClosed();
connection_->setResumable(setupPayload.resumable);
// TODO set correct version
Frame_SETUP frame(
setupPayload.resumable ? FrameFlags_RESUME_ENABLE : FrameFlags_EMPTY,
FrameSerializer::kCurrentProtocolVersionMajor,
FrameSerializer::kCurrentProtocolVersionMinor,
connection_->getKeepaliveTime(),
std::numeric_limits<uint32_t>::max(),
setupPayload.token,
std::move(setupPayload.metadataMimeType),
std::move(setupPayload.dataMimeType),
std::move(setupPayload.payload));
// TODO: when the server returns back that it doesn't support resumability, we
// should retry without resumability
// making sure we send setup frame first
frameTransport->outputFrameOrEnqueue(
connection_->frameSerializer().serializeOut(std::move(frame)));
// then the rest of the cached frames will be sent
connection_->connect(std::move(frameTransport), true);
}
void StandardReactiveSocket::serverConnect(
std::shared_ptr<FrameTransport> frameTransport,
bool isResumable) {
debugCheckCorrectExecutor();
connection_->setResumable(isResumable);
connection_->connect(std::move(frameTransport), true);
}
void StandardReactiveSocket::close() {
debugCheckCorrectExecutor();
if (auto connectionCopy = std::move(connection_)) {
connectionCopy->close(
folly::exception_wrapper(), StreamCompletionSignal::SOCKET_CLOSED);
}
}
void StandardReactiveSocket::disconnect() {
debugCheckCorrectExecutor();
checkNotClosed();
connection_->disconnect(folly::exception_wrapper());
}
std::shared_ptr<FrameTransport> StandardReactiveSocket::detachFrameTransport() {
debugCheckCorrectExecutor();
checkNotClosed();
return connection_->detachFrameTransport();
}
void StandardReactiveSocket::onConnected(std::function<void()> listener) {
debugCheckCorrectExecutor();
checkNotClosed();
connection_->addConnectedListener(std::move(listener));
}
void StandardReactiveSocket::onDisconnected(ErrorCallback listener) {
debugCheckCorrectExecutor();
checkNotClosed();
connection_->addDisconnectedListener(std::move(listener));
}
void StandardReactiveSocket::onClosed(ErrorCallback listener) {
debugCheckCorrectExecutor();
checkNotClosed();
connection_->addClosedListener(std::move(listener));
}
void StandardReactiveSocket::tryClientResume(
const ResumeIdentificationToken& token,
std::shared_ptr<FrameTransport> frameTransport,
std::unique_ptr<ClientResumeStatusCallback> resumeCallback) {
// TODO: verify/assert that the new frameTransport is on the same event base
debugCheckCorrectExecutor();
checkNotClosed();
CHECK(frameTransport && !frameTransport->isClosed());
frameTransport->outputFrameOrEnqueue(
connection_->frameSerializer().serializeOut(
connection_->createResumeFrame(token)));
// if the client was still connected we will disconnected the old connection
// with a clear error message
connection_->disconnect(
std::runtime_error("resuming client on a different connection"));
connection_->setResumable(true);
connection_->reconnect(std::move(frameTransport), std::move(resumeCallback));
}
bool StandardReactiveSocket::tryResumeServer(
std::shared_ptr<FrameTransport> frameTransport,
ResumePosition position) {
// TODO: verify/assert that the new frameTransport is on the same event base
debugCheckCorrectExecutor();
checkNotClosed();
// if the server was still connected we will disconnected it with a clear
// error message
connection_->disconnect(
std::runtime_error("resuming server on a different connection"));
// TODO: verify, we should not be receiving any frames, not a single one
connection_->connect(std::move(frameTransport), /*sendPendingFrames=*/false);
return connection_->resumeFromPositionOrClose(position);
}
void StandardReactiveSocket::checkNotClosed() const {
CHECK(connection_) << "ReactiveSocket already closed";
}
DuplexConnection* StandardReactiveSocket::duplexConnection() const {
debugCheckCorrectExecutor();
return connection_ ? connection_->duplexConnection() : nullptr;
}
void StandardReactiveSocket::debugCheckCorrectExecutor() const {
DCHECK(
!dynamic_cast<folly::EventBase*>(&executor_) ||
dynamic_cast<folly::EventBase*>(&executor_)->isInEventBaseThread());
}
bool StandardReactiveSocket::isClosed() {
debugCheckCorrectExecutor();
return !static_cast<bool>(connection_);
}
} // reactivesocket
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